Wyniki wyszukiwania - BazTech

1

Risk assessment approaches for offshore structures

Shouman M., Ghoneim N. I., El-Khatib M.

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

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2021

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Vol. 15 No. 2

401--406

EN

Risk assessment and management was established as a scientific field some 30–40 years ago. Principles and methods were developed for how to conceptualize, assess, and manage risk. These principles and methods still represent largely the foundation of this field today, but many advances have been made, linked to both the theoretical platform and practical models and procedures. The purpose of the thesis is to perform a review of these advances, with a special focus on the fundamental ideas and thinking on which these are based. We have looked for trends in perspectives and approaches, and we reflect on where further development of the risk field is needed and should be encouraged. The present study is written for readers with different types of background, not only for experts on risk. However, there is a conflict between the cost impact and safety aspect. E&P managers as well as government supervisor authorities are constantly faced with decisions to be made regarding of safety. In order to ensure comparability and to set priorities application of QRA is a useful tool to justify choices made with regard to personnel safety, environmental protection, asset damage and business reputation, it is recommended to apply the systematic cause analysis method and develop the risk management models which contains an integral approach toward the health, safety and environmental aspect.

2

Bioactive ceramic coating solution for offshore floating wind farms

Sanz D. S.., García S., Trueba L., Trueba A.

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

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2021

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Vol. 15 No. 2

407--412

EN

Biofouling is a natural phenomenon that consists of the accumulation of living organisms on an artificial surface submerged or in contact with water like Offshore platforms. This study highlights the need for offshore floating wind farms structures to consider the choice of material used in offshore applications to minimize microbial-associated and corrosion problems. For this purpose, differences in the total of seawater biofouling attached on two coated paints and three ceramic coatings in carbon steel for offshore structures were evaluated and compared. All ceramic coatings were made of incorporating, by electrophoretic deposition, active ceramic particles against biofouling as copper, silver, zinc and titanium. This experiment consisted of testing ceramic coatings and conventional paints in a real environment with high biological activity and at the same time in a shallow marine environment for a period of 1 year, which provided positive comparisons with the standard system (ASTM-D3623) for using in protecting offshore marine structures.

3

Optimal passive structural control under extreme earthquake excitations using a combined pendulum tuned mass damper

Kamel Abanoub G., Basily Remon M.

Journal of Applied Mathematics and Computational Mechanics

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2021

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Vol. 20, nr 4

51--64

EN

Many engineering applications utilize passive Tuned Mass Dampers (TMDs) in several engineering applications because of their simplicity, readiness, and their ability in attenuating structural vibrations exposed to mild or extreme earthquake excitations. The main aim of this work is to find the optimum values of the system parameters after attaching a three degree of freedom Combined Pendulum Tuned Mass Damper (3-DOF CPTMD) to the main structure to investigate if the proposed solution will assist in reducing the amplitudę of the vibration. Three optimization search techniques are utilized, and the best optimum method is determined. Moreover, the structural system was modelled mathematically to get the governing motion equations, and the system was put into state-space format before being simulated using a homemade MATLAB© code. Additionally, it is found that the proposed 3-DOF CPTMD is very effective in dampening the structural vibrations under various earthquake excitations (including extreme conditions)

4

Analiza dynamiczna żurawia typu offshore z shock absorberem

Krukowski J., Maczyński A.

Transport Przemysłowy i Maszyny Robocze

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2011

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Nr 2

28--31

PL

Charakterystyczną cechą żurawi typu offshore są znaczne ruchy ich bazy wywołane falowaniem morza. Powodują one, że żurawie te narażone są na znaczne obciążenia dynamiczne. Dlatego wyposażane są w specjalne układy pozwalające na ograniczenie przeciążeń dynamicznych. Jednym z nich jest tzw. shock absorber. W pracy przedstawiono model matematyczny żurawia offshore uzupełniony o shock absorber. Zaprezentowano wyniki symulacji numerycznych pozwalających na ocenę skuteczności działania shock absorbera w warunkach znacznych przeciążeń dynamicznych.

EN

A characteristic feature of offshore cranes are significant movements of their base caused by the sea waving. They make the cranes exposed to high dynamic loads. Therefore, they are equipped with special systems reducing the level of the dynamic overload. One of them is called shock absorber. This paper presents a mathematical model of the offshore crane supplemented with shock absorber. The results of numerical simulations to assess the effectiveness of shock absorber in a large dynamic overload are presented.

5

Modernizacja systemu ochrony katodowej platformy morskiej

Żakowski K.

Ochrona przed Korozją

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2011

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nr 7

470-471

PL

Zaprezentowano opracowaną koncepcję modernizacji starego systemu ochrony katodowej nóg platformy morskiej. Modernizacja polegała na podłączeniu układów anod galwanicznych umieszczonych na dnie morskim. Przedstawiono przykładowe wyniki pomiarów uzyskanego efektu ochronnego, tj. profile potencjałowe nogi platformy (rozkład potencjału na całej długości nogi). Uzyskane wyniki wykazały skuteczność zmodernizowanego systemu ochrony katodowej.

EN

The developed concept of upgrading the old cathodic protection system of the offshore platform legs is presented. Modernization consisted in connection of the sacrificial anode systems placed on the seabed. Some results of the measurements of obtained protective effect are presented, i.e. the potential profiles of the platform leg (potential distribution along the entire length of the leg). The results obtained show the effectiveness of the modernized cathodic protection system.

6

Zagrożenia w procesie eksploatacji dźwignic oceanotechnicznych

Rosochacki W., Hann M.

Problemy Maszyn Roboczych

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2002

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Z. 19

81-90

PL

W pracy podjęto problem zagrożeń w procesie eksploatacji dźwignic na obiektach oceanotechnicznych. Na przykładzie żurawi przeładunkowych instalowanych na platformach wiertniczych omówiono zagadnienie zarządzania bezpieczeństwem eksploatacyjnym. Sformułowano tezę, że szczególną rolę w utrzymaniu poziomu bezpieczeństwa pełni człowiek. Na przykładzie danych statystycznych określono typowe przyczyny wypadków oraz ich możliwe konsekwencje tak w zakresie strat ludzkich, jak i materialnych. Przedstawiono obszary działań prowadzących do ograniczania strat.

EN

In this work the problem of exploitation safety management of offshore cranes was taken under consideration. The statement that the exceptional meaning as far as keeping the safety level is concerned is addressed to the human factor was formulated. Using the examples of statistical data the typical causes of accidents and their possible consequences were determined equally in range of human and material loses. The areas of activities leading to minimization of the loses were presented.